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# File activerecord/lib/active_record/relation/calculations.rb, line 198def execute_simple_calculation(operation,column_name,distinct)#:nodoc:column=aggregate_column(column_name)# Postgresql doesn't like ORDER BY when there are no GROUP BYrelation=except(:order)select_value=operation_over_aggregate_column(column,operation,distinct)relation.select_values=[select_value]type_cast_calculated_value(@klass.connection.select_value(relation.to_sql),column_for(column_name),operation)end